Frequent dry cough may be caused by the following aspects: 1. It is commonly a symptom of pharyngitis, which may be caused by prolonged smoking or drinking, staying up late, and addiction to fatty, fatty and heavy foods; 2. Frequent dry cough also needs to exclude cough variant asthma. If the cough occurs in the second half of the night or early morning and the patient usually has allergic rhinitis, a bronchial excitation test should be done for differential diagnosis at this time; 3. If the patient belongs to a hypertensive disease and usually takes ACEI-type antihypertensive drugs, the drug-induced dry cough needs to be excluded; 4. If no abnormalities are seen in the chest CT examination and other organic diseases can be excluded, it is important to consider whether the cough is caused by psychological factors. There is a type of cough called psychogenic cough, which can also occur when the patient is under emotional stress causing a cough.